The Synthesis And Electro-Optical Properties Of Dipropargylfluorene And Poly(4-ethynylaniline)

Entering into the 21st century, flat panel display technology in existence,namely LCD, PDP and FED can no longer satisfy the increasing demands of people for information display device. As the new generation of flat display device, organic light-emitting device(OLED) possesses several advantages as follows: low drive voltage, high luminance and hight efficiency, broad light angle, quick response, super thin, light initiative, flectional, broad working temperature and simply modeling manufacture.The rapid development of OLED makes it one of the most interesting products in information display field.Based on materials simulation software Materias Studio, this paper applies DMol3 of MS for the analysis of electroluminescent(EL) molecule p-phenylene vinylene, measures its HOMO and LUMO and investigats its density of states and thermodynamic properties.Dipropargylfluorene (DPF) is prepared by the reaction of fluorene and propargyl bromide with the catalyst. DPF is vacuum deposited on top of ITO under 10-4 Pa for EL device. DPF shows characteristic UV-visible absorption band at 337nm and 354nm and blue PL spectrum at 432 nm corresponding to the photon energy of 2.87eV. DPF-based EL device shows a typical rectifying diode characteristics, blue EL light and turn-on voltage of 12V. The color coordinate value gathered by Spectra Scan Spectroradiometer is (0.16, 0.17), which means deep blue light. The thermal reaction properties of DPF are studied by differential scanning calorimeter and thermogravimetric analyzer. DPF exhibites to melt and reacts at 117℃and at 247℃, respectively.A new conjugated polymer with amine groups is synthesized in high yields by the polymerization of 4-ethynylaniline with various transition metal catalysts.The polymer structure is identified by various instrumental methods to conjugate polymer backbone system with p-aminophenyl substituents. The photoluminescence peak of poly (4-ethynylaniline) is located at 478nm corresponding to the photon energy of 2.60 eV. From the CV measurements, the HOMO energy level of the polymer is calculated to be 5.03 eV. In general, Pd, Pt, Ru- and Mo-based catalysts are found to be effective.The main research results of this paper provide some reference for the research of synthesis and electro-optical properties of blue light polymer EL materials.